<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .demo {
      width: 100px;
      height: 100px;
      background: #fac;
    }
  </style>
</head>
<body>
  <div class="demo"></div>
  <script>
    var demo = document.getElementsByClassName('demo')[0];
    demo.onclick = function () {
      // demo.style.opacity = '0';
      // demo.style.display = 'none';
      demo.parentElement.removeChild(demo);
    }
  </script>
</body>
</html>